Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
Income (Numerator)
Income from continuing operations after income taxes		$ 250	$ 230		$ 802	$ 619
Less amounts allocated to participating securities		1	1		2	3
Income from continuing operations after income taxes available to PPL shareowners - Basic		249	229		800	616
Plus interest charges (net of tax) related to Equity Units		0	0		0	9	[1]
Income from continuing operations after income taxes available to PPL shareowners - Diluted		249	229		800	625
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted		(1,007)	(1)		(912)	(74)
Net income (loss)		(757)	229		(110)	545
Less amounts allocated to participating securities		1	1		2	3
Net income (loss) available to PPL common shareowners - Basic		(758)	228		(112)	542
Plus interest charges (net of tax) related to Equity Units		0	0		0	9	[1]
Net income (loss) available to PPL common shareowners - Diluted		$ (758)	$ 228		$ (112)	$ 551
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)		668,415	653,132		667,698	642,002
Add incremental non-participating securities:
Share-based payment awards (in shares)		2,871	2,100		2,315	1,806
Equity Units (in shares)		0	10,560	[1]	0	21,119	[1]
Weighted-average shares - Diluted EPS (in shares)		671,286	665,792		670,013	664,927
Basic EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)		$ 0.37	$ 0.35		$ 1.2	$ 0.96
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)		(1.5)	0		(1.37)	(0.12)
Net Income (Loss) Available to PPL common shareowners (in dollars per share)		(1.13)	0.35		(0.17)	0.84
Diluted EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)		0.37	0.34		1.19	0.94
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)		(1.5)	0		(1.36)	(0.11)
Net Income (Loss) Available to PPL common shareowners (in dollars per share)		$ (1.13)	$ 0.34		$ (0.17)	$ 0.83
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	[2]	992	922		2,437	2,018
Common stock issued under DRIP (in shares)		424	0		843	0
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS		348	790		1,085	2,060
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS		0	1		73	1
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS		0	0		0	61

[1] In 2014, the If-Converted Method was applied to the Equity Units prior to the March 2014 settlement.

[2] Includes stock options exercised, vesting of performance units, vesting of restricted stock and restricted stock units and conversion of stock units granted to directors.